如何在多个文件的尾部使用 grep

Question

我需要 tail 几个文件，其中大部分信息我都删除了（使用 grep）。现在我的输出被文件名弄脏了。我该如何删除它们？

问题简述： $ tail -F /log/rest_server*.log | egrep -v ' INFO (<some regext>)'

返回：

==> /log/rest_server_dbs0.log <==

==> /log/rest_server_dbs1.log <==
<some useful data1>

==> /log/rest_server_dbs0.log <==

==> /log/rest_server_dbs1.log <==
<some useful data2>

==> /log/rest_server_dbs0.log <==

==> /log/rest_server_dbs1.log <==

==> /log/rest_server_dbs0.log <==

==> /log/rest_server_dbs1.log <==

==> /log/rest_server_dbm0.log <==
<some useful data3>

==> /log/rest_server_dbs1.log <==

==> /log/rest_server_dbs0.log <==

==> /log/rest_server_dbs1.log <==

==> /log/rest_server_dbs0.log <==

==> /log/rest_server_dbs1.log <==

==> /log/rest_server_dbs0.log <==

==> /log/rest_server_dbs1.log <==

==> /log/rest_server_dbm0.log <==
<some useful data4>

==> /log/rest_server_dbs1.log <==

如果没有数据，我该如何删除这些文件名和黑线？

取得成果

==> /log/rest_server_dbs1.log <==
<some useful data1>
<some useful data2>

==> /log/rest_server_dbm0.log <==
<some useful data3>
<some useful data4>

Answer 1

您可以改用以下命令：

$ tail -F /log/rest_server*.log | sed -e "/^==>/d;/^$/d" | egrep -v ' INFO (<some regext>)'

sed 命令删除以“==>”开头的行和空行；